docs: Clarify why we currently prefer X-Ray over ADOT in Tracing

[hjgraca]

Please provide the issue number

Issue number: #344

Summary

In the Tracer docs, when introducing the utility, we should clarify why we use X-Ray over ADOT/OTEL - which appears to be the recommended way of tracing functions by other AWS teams. The Python docs for Tracer have a banner that explains the reasoning, and since it's a somewhat common question from customers we should add the same banner.

Changes

Please provide a summary of what's being changed

Add note

!!! note "Tracer relies on AWS X-Ray SDK over [OpenTelememetry Distro (ADOT)](https://aws-otel.github.io/docs/getting-started/lambda){target="_blank"} for optimal cold start (lower latency)."

User experience

Please share what the user experience looks like before and after this change

Checklist

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• Meets tenets criteria
• I have performed a self-review of this change
• Changes have been tested
• Changes are documented
• PR title follows conventional commit semantics

Is this a breaking change?

RFC issue number:

Checklist:

• Migration process documented
• Implement warnings (if it can live side by side)

Acknowledgment

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[codecov-commenter]

Codecov Report

Patch coverage has no change and project coverage change: -0.15 ⚠️

Comparison is base (38130a1) 69.31% compared to head (13b3bad) 69.16%.

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Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #347      +/-   ##
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- Coverage    69.31%   69.16%   -0.15%     
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  Files           79       79              
  Lines         3464     3464              
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- Hits          2401     2396       -5     
- Misses        1063     1068       +5     

Flag	Coverage Δ
unittests	69.16% <ø> (-0.15%)	⬇️

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see 1 file with indirect coverage changes

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[amirkaws]

LGTM